batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
==================================================================
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
BUG: KASAN: use-after-free in ntfs_ucsncmp fs/ntfs/unistr.c:156 [inline]
BUG: KASAN: use-after-free in ntfs_are_names_equal+0x178/0x1a0 fs/ntfs/unistr.c:75
Read of size 2 at addr ffff8881ca23cee8 by task syz-executor.3/7224
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!

CPU: 0 PID: 7224 Comm: syz-executor.3 Not tainted 4.14.222-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x14b/0x1e7 lib/dump_stack.c:58
 print_address_description.cold.6+0x9/0x1ca mm/kasan/report.c:252
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report mm/kasan/report.c:409 [inline]
 kasan_report.cold.7+0x11a/0x2d3 mm/kasan/report.c:393
 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:428
 ntfs_ucsncmp fs/ntfs/unistr.c:156 [inline]
 ntfs_are_names_equal+0x178/0x1a0 fs/ntfs/unistr.c:75
 ntfs_attr_find+0x36c/0xb60 fs/ntfs/attrib.c:628
 ntfs_external_attr_find fs/ntfs/attrib.c:1107 [inline]
 ntfs_attr_lookup+0x1085/0x2470 fs/ntfs/attrib.c:1205
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
 ntfs_read_locked_attr_inode fs/ntfs/inode.c:1266 [inline]
 ntfs_attr_iget+0x742/0x23c0 fs/ntfs/inode.c:251
 ntfs_read_locked_inode+0x25c1/0x51f0 fs/ntfs/inode.c:986
 ntfs_iget+0xda/0x110 fs/ntfs/inode.c:190
 load_system_files fs/ntfs/super.c:1988 [inline]
 ntfs_fill_super+0x4c0c/0x76c0 fs/ntfs/super.c:2908
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
 mount_bdev+0x26f/0x330 fs/super.c:1134
 ntfs_mount+0x10/0x20 fs/ntfs/super.c:3065
 mount_fs+0x7f/0x270 fs/super.c:1237
 vfs_kern_mount.part.9+0x58/0x3c0 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2549 [inline]
 do_mount+0x352/0x2af0 fs/namespace.c:2879
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
 SYSC_mount fs/namespace.c:3095 [inline]
 SyS_mount+0xb1/0xd0 fs/namespace.c:3072
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x466baa
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
RSP: 002b:00007f5aa803ffa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000466baa
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f5aa8040000
RBP: 00007f5aa8040040 R08: 00007f5aa8040040 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f5aa8040000 R15: 000000002007dc00

The buggy address belongs to the page:
page:ffffea0007288f00 count:0 mapcount:0 mapping:          (null) index:0x1
flags: 0x17ffe0000000000()
raw: 017ffe0000000000 0000000000000000 0000000000000001 00000000ffffffff
raw: ffffea0007288f60 ffffea0007283060 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881ca23cd80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881ca23ce00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881ca23ce80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                          ^
 ffff8881ca23cf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881ca23cf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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